Method for manufacturing a propeller for a propeller pump, and propeller for a propeller pump

Abstract

A method for manufacturing a propeller for a propeller pump includes providing a base propeller including a hub extending from an axial end in the axial direction, and a plurality of blades fixedly connected to the hub, each blade including a pressure side, a suction side, a leading edge, an initial trailing edge, and a blade tip extending from the leading edge to the initial trailing edge at the end of the blade facing away from the hub, trimming each of the blades of the base propeller the axial direction, and forming a modified trailing edge bye removing a part of the initial trailing edge along the entire pressure side from the hub to the blade tip.

What is claimed is: 
     
       1. A method for manufacturing a propeller for a propeller pump, the propeller configured to rotate about an axial direction, comprising:
 providing a base propeller comprising a hub extending from an axial end in the axial direction, and a plurality of blades fixedly connected to the hub, each blade of the plurality of blades comprising a pressure side, a suction side, a leading edge, an initial trailing edge, and a blade tip extending from the leading edge to the initial trailing edge at an end of the blade facing away from the hub; 
 trimming each of the plurality of blades of the base propeller in the axial direction; and 
 forming a modified trailing edge by removing a part of the initial trailing edge along the entire pressure side from the hub to the blade tip, 
 at each blade of the plurality of blades forming a final trailing edge by removing a part of the pressure side abutting against the modified trailing edge along an entirety of the modified trailing edge, so that a transition face is produced connecting the pressure side with the final trailing edge. 
 
     
     
       2. The method in accordance with  claim 1 , wherein each modified trailing edge is formed by machining. 
     
     
       3. The method in accordance with  claim 1 , wherein for each blade a first axial distance measured from the axial end of the hub along the hub to the initial trailing edge is smaller than a second axial distance measured from the axial end of the hub along the hub to the modified trailing edge. 
     
     
       4. The method in accordance with  claim 3 , wherein a duty point for the propeller is provided, and a trimming distance defined as the difference between the second axial distance and the first axial distance is adjusted such that the duty point is realized. 
     
     
       5. The method in accordance with  claim 4 , wherein the modified trailing edge is a trailing face, and the trailing face is non-curved. 
     
     
       6. The method in accordance with  claim 5 , wherein the trailing face includes a trimming angle with the axial direction, the trimming angle is measured between the trailing face and the hub, and the trimming angle is at least 90°. 
     
     
       7. The method in accordance with  claim 6 , wherein the modified trailing edge is formed by machining the initial trailing edge with the trimming angle in such a way that a length of the blade is reduced at the hub by an amount, which equals the trimming distance. 
     
     
       8. The method in accordance with  claim 1 , wherein the transition face extends from the hub along the entirety of the final trailing edge, and the transition face is inclined towards the pressure side. 
     
     
       9. The method in accordance with  claim 1 , wherein the transition face is a non-curved face. 
     
     
       10. The method in accordance with  claim 9 , wherein the transition face includes a filing angle with the axial direction with the filing angle being different from 90°. 
     
     
       11. The method in accordance with  claim 1 , wherein the plurality of blades of the propeller comprises exactly three blades. 
     
     
       12. A propeller for a propeller pump, wherein the propeller is manufactured according to  claim 1 . 
     
     
       13. A propeller pump for conveying a fluid, comprising:
 a propeller according to  claim 12 . 
 
     
     
       14. The propeller pump in accordance with  claim 13 , further comprising a pump housing having an inlet and an outlet for the fluid, a pump shaft configured to rotate the propeller about the axial direction, and a drive unit configured to rotate the pump shaft, the propeller fixedly connected to the pump shaft, and the drive unit arranged inside the pump housing. 
     
     
       15. The propeller pump in accordance with  claim 13 , wherein the propeller pump is a submersible pump.